Attachment for a chain saw



FIG. 1 is a top left front perspective view of an attachment for a chain saw showing my new design;

FIG. 2 is a left side elevational view;

FIG. 3 is a top plan view;

FIG. 4 is a front elevational view;

FIG. 5 is a rear elevational view;

FIG. 6 is a right side elevational view; and

FIG. 7 is a bottom plan view thereof.

The broken line showing of a chain saw bar in FIGS. 4, 5, and 6 is for environmental purposes only and forms no part of the claimed design. 

The ornamental design for an attachment for a chain saw, as shown and described. 